My favourites ever were Dandy themed Desperate Dan Cow Pie flavour. They were awesome. They don't seem to do them anymore (for obvious reasons), but there's not even another similar thing. Closest I got was some Bob the Builder snacks.

Though if it has to be proper crisps, it has to be Marmite. And I'm not even a fan of real Marmite, I just think it's alright.